Specification: - OS: CentOS, Ubuntu, RHEL, Debian, Fedora and others. - Cloud Platforms: Amazon S3/EC2/EBS, Rackspace, Digital Ocean, Linode. - High availability solutions: Load balancing, Clustering, MySQL Replication. - Control Panel: WHM/cPanel, Plesk, Webmin/Virtualmin, ISPConfig, Zpanel, i-mscp. - Web Server: Apache, Ngnix, LightHTTPD. - Databases: MySQL, MariaDB, PostgreSQL, SQLite3. - Email System: Postfix, Dovecot, Roundcube, squirrelmail and others. - Monitoring System: Nagios, Zabbix, Cacti. - Open Source Intrusion Detection Tools: OSSEC, Snort. - Project Management: Redmine, OTRS etc. - XMPP: OpenFire, eJabberd, Prosody IM. - Streaming server: Nginx-RTMP, Red5, FFMPEG. - VOIP: Asterisk, FreePBX. - Virtualization: Vmware, Virtualbox etc. - Miscellaneous: Docker, PCI Compliance, Owncloud, Troubleshooting